So if I want a RAID server, without actually buying a pre-made unit with RAID5, and an OS I am not familiar with...

Can I just buy an external RAID5 array with hot swappable hard drives, and its own hardware card and cable?

Can I install Amazingcharts database on the external array, and not have to install it in the server...

In case it crash, then at least I can replace the computer by removing the card, and plugging it into another system (with either XP or Win 7)?